Ok so about 2 years ago a lady backed up into this civic, and did some damage. I'm considering replacing the whole front bulkhead, since my car is as clean as can be, no rust at all, and only defects are the bumper, hood, and that whole front bulkhead assembly.

How hard would the replacement of the bulkhead be?
I see its around $220 for that (new)

its the front metal (frame) so to speak. It holds the radiator and lights and crap. The hood also latches onto this. Its the metal piece going left, right if you are facing the car from the front. there is an upper and lower part. get it?

ok i dont have a welding tool, but if i bolt everything on, i can take it to a shop and get the parts spot welded on for not to much money right?
and also, im leaking coolant, not from the radiator, but from the rightside of the block, kind of by the belt, any ideas on what i should do??

well, i hit a curb, (front side) going about 10- mabye 15, and the bottom thingy, radiator support went in about 7-8 inches, so i pulled that off, i pulled off the bottom and top and everything.
But at the scene of when I hit the curb, i back up and coolant was on the ground.
I was like shit, its leaking. I back up to a new spot and kept the car on, and no coolant was leaking, a very little bit was on the floor, but that was dripping from the coolant on the block from before, my temp was normal. Was it not leaking because perhaps there wasnt enough coolant, or to much was lost at impact?
and my obd1 scan came up with errors 3 and 6 and one of those is ECT Engine Coolant Temp sensor.